EP0829863A3 - Optical pickup - Google Patents

Optical pickup Download PDF

Info

Publication number
EP0829863A3
EP0829863A3 EP97115197A EP97115197A EP0829863A3 EP 0829863 A3 EP0829863 A3 EP 0829863A3 EP 97115197 A EP97115197 A EP 97115197A EP 97115197 A EP97115197 A EP 97115197A EP 0829863 A3 EP0829863 A3 EP 0829863A3
Authority
EP
European Patent Office
Prior art keywords
diffraction grating
optical pickup
light source
optical disc
passing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP97115197A
Other languages
German (de)
French (fr)
Other versions
EP0829863A2 (en
Inventor
Hitoshi c/o Pioneer Electronic Corp. Furuhata
Aki c/o Pioneer Electronic Corp. Terajima
Shigeru c/o Pioneer Electronic Corp. Takaya
Masufumi c/o Pioneer Electronic Corp. Asada
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pioneer Corp
Original Assignee
Pioneer Electronic Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pioneer Electronic Corp filed Critical Pioneer Electronic Corp
Publication of EP0829863A2 publication Critical patent/EP0829863A2/en
Publication of EP0829863A3 publication Critical patent/EP0829863A3/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1353—Diffractive elements, e.g. holograms or gratings
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/18—Diffraction gratings
    • G02B5/1814—Diffraction gratings structurally combined with one or more further optical elements, e.g. lenses, mirrors, prisms or other diffraction gratings
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/094—Methods and circuits for servo offset compensation
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/13—Optical detectors therefor
    • G11B7/131—Arrangement of detectors in a multiple array
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0908—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for focusing only
    • G11B7/0912—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for focusing only by push-pull method

Abstract

An optical pickup is provided which comprises a light source (10), an objective lens (40) for converging a beam from the light source onto an optical disc (50), a diffraction grating (22) for passing a beam returning from the optical disc and a photodetector (70) for receiving returning beams passing through the diffraction grating. The diffraction grating (22) is divided into two areas (a, b) including alternatively arranged first diffraction grating pattern (a) and second diffraction grating pattern (b).
EP97115197A 1996-09-13 1997-09-02 Optical pickup Withdrawn EP0829863A3 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP243077/96 1996-09-13
JP24307796 1996-09-13
JP24307796A JP3524287B2 (en) 1996-09-13 1996-09-13 Optical pickup

Publications (2)

Publication Number Publication Date
EP0829863A2 EP0829863A2 (en) 1998-03-18
EP0829863A3 true EP0829863A3 (en) 2000-01-12

Family

ID=17098448

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97115197A Withdrawn EP0829863A3 (en) 1996-09-13 1997-09-02 Optical pickup

Country Status (3)

Country Link
US (1) US5805557A (en)
EP (1) EP0829863A3 (en)
JP (1) JP3524287B2 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW336311B (en) * 1997-10-15 1998-07-11 Ind Tech Res Inst Method and device for focusing and tracking of an optical head
EP0990927A3 (en) * 1998-09-28 2000-12-13 Sharp Kabushiki Kaisha Diffraction grating having multiple gratings with different cycles for generating multiple beams and optical pickup using such diffraction grating
EP1107242A3 (en) * 1999-12-10 2001-09-26 Victor Company Of Japan, Ltd. Optical pick-up
JP4778662B2 (en) * 2000-06-29 2011-09-21 パナソニック株式会社 Optical head device and optical information processing device
EP1393308A1 (en) 2001-05-03 2004-03-03 Koninklijke Philips Electronics N.V. Optical scanning device
US20060066948A1 (en) * 2004-09-24 2006-03-30 Matsushita Electric Industrial Co., Ltd. Multi-level and gray-level diffraction gratings
DE102014010777A1 (en) 2014-01-30 2015-07-30 Dürr Systems GmbH High voltage cables

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0452793A2 (en) * 1990-04-12 1991-10-23 Matsushita Electric Industrial Co., Ltd. Optical head having a hologram associated with the objective lens
US5412631A (en) * 1992-07-10 1995-05-02 Matsushita Electric Industrial Co., Ltd. Optical head apparatus for storing, reading or erasing information, and optical information reproducing method and optical information apparatus for optically reading information stored in an optical memory

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07130022A (en) * 1993-11-08 1995-05-19 Matsushita Electric Ind Co Ltd Optical head device and optical element
US5652744A (en) * 1996-02-08 1997-07-29 Industrial Technology Research Institute Single surface diffractive element for optical pickup heads

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0452793A2 (en) * 1990-04-12 1991-10-23 Matsushita Electric Industrial Co., Ltd. Optical head having a hologram associated with the objective lens
US5412631A (en) * 1992-07-10 1995-05-02 Matsushita Electric Industrial Co., Ltd. Optical head apparatus for storing, reading or erasing information, and optical information reproducing method and optical information apparatus for optically reading information stored in an optical memory

Also Published As

Publication number Publication date
JP3524287B2 (en) 2004-05-10
EP0829863A2 (en) 1998-03-18
JPH1092001A (en) 1998-04-10
US5805557A (en) 1998-09-08

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